Gọi \( A=2^1+2^2+2^3+2^4+...+2^{99}+2^{100}\)
\(2A=2^2+2^3+2^4+2^5+...+2^{100}+2^{101}\)
\(2A-A=2^2+2^3+2^4 +2^5+...+2^{100}+2^{101}-\left(2^1+2^2+2^3+2^4+...+2^{99}+2^{100}\right)\)
\(A=2^{101}-2\)
Gọi \( A=2^1+2^2+2^3+2^4+...+2^{99}+2^{100}\)
\(2A=2^2+2^3+2^4+2^5+...+2^{100}+2^{101}\)
\(2A-A=2^2+2^3+2^4 +2^5+...+2^{100}+2^{101}-\left(2^1+2^2+2^3+2^4+...+2^{99}+2^{100}\right)\)
\(A=2^{101}-2\)
Thực hiện phép tính:
1, -7/12. 11/8- 37/8. 7/12+ 1/2
2, ( 2/3- 1/4- 5/6 ). ( -2) mũ 2 + 3/2: -15/4
3, -2/5+ 3/10- 3/5+ 7/10- 3/2
Thực hiện phép tính:
1, -7/12. 11/8- 37/8. 7/12+ 1/2
2, ( 2/3- 1/4- 5/6 ). ( -2) mũ 2 + 3/2: -15/4
3, -2/5+ 3/10- 3/5+ 7/10- 3/2
Thực hiện phép tính:
1, -7/12. 11/8- 37/8. 7/12+ 1/2
2, ( 2/3- 1/4- 5/6 ). ( -2) mũ 2 + 3/2: -15/4
3, -2/5+ 3/10- 3/5+ 7/10- 3/2
Tính:
1, 3 1/2 + 4 3/5
2, 3/4 + 6 5/8
3, 5 3/8 + 9 2/7
4, 4 1/2 - 2 3/10
Tính:
1, 3 1/2 + 4 3/5
2, 3/4 + 6 5/8
3, 5 3/8 + 9 2/7
4, 4 1/2 - 2 3/10
Thực hiện phép tính:
1, -3/4+ ( 3- 1/4 ) - ( 5/4- 9/2 )
2, -5/7. 13/19+ -5/7. 6/19+ 5/7
3, 2/5- 2/5. 8/3- 2/5. 5/8
Thực hiện phép tính:
1, -3/4+ ( 3- 1/4 ) - ( 5/4- 9/2 )
2, -5/7. 13/19+ -5/7. 6/19+ 5/7
3, 2/5- 2/5. 8/3- 2/5. 5/8
Thực hiện phép tính:
1, -3/4+ ( 3- 1/4 ) - ( 5/4- 9/2 )
2, -5/7. 13/19+ -5/7. 6/19+ 5/7
3, 2/5- 2/5. 8/3- 2/5. 5/8
Tính:
1, -1/5- (-2/3 )
2, -2/5- 1/7
3, 3/5- 5/7
4, 4/7+ -5/8 - 3/28